SIST EN 60939-2:2005

Passive filter units for electromagnetic interference suppression -- Part 2: Sectional specification: Passive filter units for which safety tests are appropriate - Test methods and general requirements

applies to passive filter units for electromagnetic interference suppression which fall within the scope of the Generic Specification EN 60939-1. The scope of this Sectional specification is restricted to passive filter units for which safety tests are appropriate. This implies that filters specified according to this Sectional specification will either be connected to mains supplies, when compliance with the mandatory tests of Table 3 is necessary, or used in other circuit positions where the equipment specification prescribes that some or all of these safety tests are required.

Passive Filter für die Unterdrückung von elektromagnetischen Störungen -- Teil 2: Rahmenspezifikation: Filter, für die Sicherheitsprüfungen vorgeschrieben sind - Prüfverfahren und allgemeine Anforderungen

Filtres passifs d'antiparasitage -- Partie 2: Spécification intermédiaire: Filtres passifs pour lesquels des essais de sécurité sont appropriés - Méthodes d'essai et règles générales

L'IEC 60939-2:2005 s’applique aux filtres passifs d’antiparasitage qui entrent dans le domaine d’application de la spécification générique IEC 60939-1.
Le domaine d’application de la présente spécification intermédiaire est restreint aux filtres passifs pour lesquels des essais de sécurité sont appropriés. Par conséquent, les filtres spécifiés selon la présente spécification intermédiaire sont connectés aux réseaux d’alimentation, lorsque la conformité aux essais obligatoires présentés dans le Tableau 3 est nécessaire, ou sont utilisés dans d’autres endroits du circuit pour lesquels la spécification de l’équipement prescrit que tout ou partie de ces essais de sécurité est exigé.
La présente spécification intermédiaire s’applique aux filtres passifs connectés à un réseau d’alimentation en courant alternatif ou à une autre alimentation dont la tension nominale ne dépasse pas 1 000 V en courant alternatif, et dont la fréquence nominale ne dépasse pas 400 Hz ou 1 000 V en courant continu.
Les principales modifications effectuées entre la première et la seconde édition comprennent:
– Les mesurages de la capacité et de la tangente de l’angle de perte (tan δ), la résistance de ligne continue ou la chute de tension continue au courant assigné, la tension de choc, l’inflammabilité passive, la surcharge de courant, la résistance du marquage au solvant, la résistance des composants au solvant et l’inflammabilité active ont été ajoutés à l’Article 4, procédures d’essai et de mesure.
Le contenu du corrigendum de novembre 2005 a été inclus dans la présente copie.

Pasivni filtri za dušenje elektromagnetnega motenja – 2. del: Področna specifikacija: Pasivni filtri, za katere varnostni preskusi ustrezajo – Preskusne metode in splošne zahteve (IEC 60939-2:2005)

General Information

• Status: Published
• Publication Date: 30-Nov-2005
• ICS: 31.160 - Electric filters
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2005
• Due Date: 01-Dec-2005
• Completion Date: 01-Dec-2005
• Ref Project: EN 60939-2:2005 - Passive filter units for electromagnetic interference suppression - Part 2: Sectional specification: Passive filter units for which safety tests are appropriate - Test methods and general requirements

Relations

• Amended By: SIST EN 60939-2:2005/kFprA1:2023 - Amendment 1 - Passive filter units for electromagnetic interference suppression - Part 2: Sectional specification - Passive filter units for which safety tests are appropriate - Test methods and general requirements
• Effective Date: 02-Aug-2022
• Replaces: SIST EN 133200:2002 - Sectional Specification: Passive filter units for electromagnetic interference suppression (Filters for which safety tests are required)
• Effective Date: 06-May-2014
• Replaces: SIST EN 133200:2002 - Sectional Specification: Passive filter units for electromagnetic interference suppression (Filters for which safety tests are required)
• Effective Date: 28-Jan-2023
• Replaces: SIST EN 133200:2002 - Sectional Specification: Passive filter units for electromagnetic interference suppression (Filters for which safety tests are required)
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI SIST EN 60939-2:2005

STANDARD
december 2005
Pasivni filtri za dušenje elektromagnetnega motenja – 2. del: Področna
specifikacija: Pasivni filtri, za katere varnostni preskusi ustrezajo – Preskusne
metode in splošne zahteve (IEC 60939-2:2005)
Passive filter units for electromagnetic interference suppression – Part 2: Sectional
specification: Passive filter units for which safety tests are appropriate – Test
methods and general requirements (IEC 60939-2:2005)
ICS 31.160 Referenčna številka
SIST EN 60939-2:2005(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

---------------------- Page: 1 ----------------------

EUROPEAN STANDARD EN 60939-2
NORME EUROPÉENNE
EUROPÄISCHE NORM April 2005

ICS 31.160 Supersedes EN 133200:1999


English version


Passive filter units for electromagnetic interference suppression
Part 2: Sectional specification:
Passive filter units for which safety tests are appropriate –
Test methods and general requirements
(IEC 60939-2:2005)


Filtres passifs d'antiparasitage Passive Filter für die Unterdrückung von
Partie 2: Spécification intermédiaire: elektromagnetischen Störungen
Filtres passifs pour lesquels des essais Teil 2: Rahmenspezifikation:
de sécurité sont appropriés – Filter, für die Sicherheitsprüfungen
Méthodes d'essai et règles générales vorgeschrieben sind –
(CEI 60939-2:2005) Prüfverfahren und allgemeine
Anforderungen
(IEC 60939-2:2005)


This European Standard was approved by CENELEC on 2005-03-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60939-2:2005 E

---------------------- Page: 2 ----------------------

EN 60939-2:2005 - 2 -
Foreword
The text of document 40/1510/FDIS, future edition 2 of IEC 60939-2, prepared by IEC TC 40,
Capacitors and resistors for electronic equipment, was submitted to the IEC-CENELEC parallel vote
and was approved by CENELEC as EN 60939-2 on 2005-03-01.
This European Standard supersedes EN 133200:1999.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2005-12-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2008-03-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60939-2:2005 was approved by CENELEC as a European
Standard without any modification.
__________

---------------------- Page: 3 ----------------------

- 3 - EN 60939-2:2005
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
NOTE Where an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
1) 2)
IEC 60060-1 - High-voltage test techniques HD 588.1 S1 1991
Part 1: General definitions and test
requirements

1) 2)
IEC 60062 - Marking codes for resistors and EN 60062 2005
capacitors

1) 2)
IEC 60068-1 - Environmental testing EN 60068-1 1994
Part 1: General and guidance

1) 2)
IEC 60068-2-17 - Part 2: Tests - Test Q: Sealing EN 60068-2-17 1994

1) 2)
IEC 60085 - Electrical insulation - Thermal EN 60085 2004
classification

1) 2)
IEC 60335-1 - Household and similar electrical EN 60335-1 2002
2)
(mod) appliances - Safety + A11 2004
Part 1: General requirements

1)
IEC 60384-9 - Fixed capacitors for use in electronic - -
equipment. Part 9: Sectional
specification: Fixed capacitors of ceramic
dielectric, Class 2.

1)
IEC 60384-14 - Part 14: Sectional specification: Fixed - -
capacitors for electromagnetic
interference suppression and connection
to the supply mains

IEC 60664 Series Insulation coordination for equipment EN 60664 Series
within low-voltage systems

1) 2)
IEC 60938-1 - Fixed inductors for electromagnetic EN 60938-1 1999
interference suppression
Part 1: Generic specification

1) 2)
IEC 60939-1 - Passive filter units for electromagnetic EN 60939-1 2005
interference suppression
Part 1: Generic specification

1)
Undated reference.
2)
Valid edition at date of issue.

---------------------- Page: 4 ----------------------

EN 60939-2:2005 - 4 -
Publication Year Title EN/HD Year
1)
IEC 60940 - Guidance information on the application - -
of capacitors, resistors, inductors and
complete filter units for radio interference
suppression

1) 2)
IEC 61140 - Protection against electric shock - EN 61140 2002
Common aspects for installation and
equipment

---------------------- Page: 5 ----------------------

INTERNATIONAL IEC


STANDARD 60939-2





Second edition
2005-02


Passive filter units for electromagnetic
interference suppression –
Part 2:
Sectional specification –
Passive filter units for which safety
tests are appropriate –
Test methods and general requirements
© IEC 2005 ⎯ Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
X
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

---------------------- Page: 6 ----------------------

– 2 – 60939-2  IEC:2005(E)
CONTENTS
FOREWORD.4

1 General .6
1.1 Scope.6
1.2 Normative references .6
1.3 Information to be given in a detail specification .7
1.4 Definitions .8
1.5 Marking .9
2 Preferred ratings and characteristics.10
2.1 Preferred characteristics.10
2.2 Preferred values of ratings.10
3 Quality assessment procedures .11
3.1 Primary stage of manufacture .11
3.2 Structurally similar filters .11
3.3 Certified records of released lots.11
3.4 Approval testing.11
3.5 Quality conformance inspection .13
4 Test and measurement procedures .18
4.1 Earth inductors incorporated in filters .18
4.2 Capacitance and tan δ measurements.18
4.3 Visual examination and check of dimensions .18
4.4 Voltage proof.19
4.5 Insulation resistance.20
4.6 DC line resistance or voltage drop at rated current .20
4.7 Insertion loss.21
4.8 Discharge resistance .21
4.9 Robustness of terminations.22
4.10 Resistance to soldering heat.22
4.11 Solderability .22
4.12 Rapid change of temperature .22
4.13 Vibration.23
4.14 Bump .23
4.15 Shock.24
4.16 Container sealing .24
4.17 Climatic sequence .25
4.18 Damp heat, steady state .26
4.19 Temperature rise .26
4.20 Impulse voltage .28
4.21 Endurance.29
4.22 Charge and discharge.31
4.23 Passive flammability .32
4.24 Current overload.32
4.25 Solvent resistance of the marking .32
4.26 Component solvent resistance .33
4.27 Active flammability.33

---------------------- Page: 7 ----------------------

60939-2 © IEC:2005(E) – 3 –
Annex A (normative) Test schedule for qualification approval – Assessment level D / DZ .34
Annex B (normative) Test schedule for safety requirements only.38
Annex C (normative) Circuit for the impulse voltage test .40
Annex D (normative) Circuit for the endurance test.42
Annex E (normative) Declaration of design .43

Figure 1 – Impulse wave form .29
Figure C.1 – Impulse voltage test circuit.40

Table 1 – Classification of class X capacitors .8
Table 2 – Classification of class Y capacitors .9
Table 3 – Tests concerning safety requirements only.14
Table 4 – Sampling plan – Safety and performance tests qualification approval –
Assessment level D / DZ .15
Table 5 – Lot-by-lot-tests – Assessment level D / DZ .16
Table 6 – Lot-by-lot test – Safety tests only approval.16
Table 7 – Periodic tests – Assessment level D / DZ .17
Table 8 – Creepage distances and clearances.18
Table 9 – Voltage proof.19
Table 10 – Insulation resistance.20
Table 11 – Preferred severities .24
Table 12 – Measurements and requirements after charge and discharge.31
Table A.1 – Test schedule for qualification approval – Assessment level D / DZ .34
Table B.1 – Test schedule for safety requirements only .38
Table C.1 – Values of C , C , R , R , C .40
X T P S P
Table C.2 – Values and tolerances of C , t , t .41
x r d

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– 4 – 60939-2 © IEC:2005(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________

PASSIVE FILTER UNITS FOR ELECTROMAGNETIC
INTERFERENCE SUPPRESSION –

Part 2: Sectional specification –
Passive filter units for which safety tests are appropriate –
Test methods and general requirements


FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60939-2 has been prepared by IEC technical committee 40:
Capacitors and resistors for electronic equipment.
This second edition cancels and replaces the first edition published in 1988. This second
edition constitutes a technical revision.
The major changes that have been made between the first and the second edition are :
– Capacitance and tan δ measurements, d.c. line resistance or voltage drop at rated current,
impulse voltage, passive flammability, current overload, solvent resistance of marking,
component solvent resistance and active flammability have been added to Clause 4, test
and measurement procedures.

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60939-2  IEC:2005(E) – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
40/1510/FDIS 40/1537/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
IEC 60939 consists of the following parts, under the general title Passive filter units for
electromagnetic interference suppression
Part 1: Generic specification
Part 2: Sectional specification: Test methods and general requirements
Part 2-1: Blank detail specification – Passive filter units for electromagnetic interference
suppression – Filters for which safety tests are required (Assessment level D / DZ)
Part 2-2: Blank detail specification – Passive filter units for electromagnetic interference
suppression – Filters for which safety tests are required (Safety tests only)

The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.

A bilingual version of this publication may be issued at a later date.

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– 6 – 60939-2 © IEC:2005(E)
PASSIVE FILTER UNITS FOR ELECTROMAGNETIC
INTERFERENCE SUPPRESSION –

Part 2: Sectional specification –
Passive filter units for which safety tests are appropriate –
Test methods and general requirements



1 General
1.1 Scope
This Sectional specification applies to passive filter units for electromagnetic interference
suppression which fall within the scope of the Generic Specification IEC 60939-1.
The scope of this Sectional specification is restricted to passive filter units for which safety
tests are appropriate. This implies that filters specified according to this Sectional
specification will either be connected to mains supplies, when compliance with the mandatory
tests of Table 3 is necessary, or used in other circuit positions where the equipment
specification prescribes that some or all of these safety tests are required.
This Sectional specification applies to passive filter units which will be connected to an a.c.
mains or other supply with a nominal voltage not exceeding 1 000 V a.c., with a nominal
frequency not exceeding 400 Hz, or 1 000 V d.c.
1.2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
NOTE Components other than inductors and capacitors in the filter unit should fulfil requirements in the relevant
IEC Standard.
IEC 60060-1, High-voltage test techniques – Part 1: General definitions and test requirements
IEC 60062, Marking codes for resistors and capacitors
IEC 60068-1, Environmental testing – Part 1: General and guidance
IEC 60068-2-17, Basic environmental testing procedures – Part 2: Tests – Test Q: Sealing
IEC 60085, Thermal evaluation and classification of electrical insulation
IEC 60335-1, Safety of household and similar electrical appliances – Part 1: General
requirements
IEC 60384-9, Fixed capacitors for use in electronic equipment – Part 9: Sectional
specification: Fixed capacitors of ceramic dielectric, Class 2
IEC 60384-14, Fixed capacitors for use in electronic equipment – Part 14: Sectional
specification: Fixed capacitors for electromagnetic interference suppression and connection to
the supply mains

---------------------- Page: 11 ----------------------

60939-2  IEC:2005(E) – 7 –
IEC 60664 (all parts), Insulation coordination for equipment within low-voltage systems
IEC 60938-1, Fixed inductors for electromagnetic interference suppression – Part 1: Generic
specification
IEC 60939-1, Passive filter units for electromagnetic interference suppression – Part 1:
Generic specification
IEC 60940, Guidance information on the application of capacitors, resistors, inductors and
complete filter units for radio interference suppression
IEC 61140, Protection against electric shock – Common aspects for installation and
equipment
1.3 Information to be given in a detail specification
1.3.1 General
The detail specifications shall be derived from the relevant blank detail specification.
Detail specifications shall not specify requirements inferior to those of the generic, sectional
or blank detail specification. When more severe requirements are included, they shall be
listed in 1.9 of the detail specification, and indicated in the test schedules, for example by an
asterisk.
NOTE The information given in 1.3.2 may, for convenience, be presented in tabular form.
The following information shall be given in each detail specification and the values quoted
shall preferably be selected from the appropriate clause of this sectional specification.
1.3.2 Outline drawing and dimensions
There shall be an illustration of the filter as an aid to easy recognition and for comparison of
the filter with others. Dimensions and their associated tolerances, which affect inter-
changeability and mounting, shall be given in the detail specification. All dimensions shall
preferably be stated in millimetres.
Normally, the numerical values shall be given for the length of the body, the width and height
of the body and the wire spacing, or for cylindrical types, the body diameter and the length
and diameter of the terminations. When necessary, for example when a range of filters is
covered by a single detail specification, their dimensions and their associated tolerances shall
be placed in a table following the drawing.
In addition, the detail specification shall state such other dimensional information as will
adequately describe the filter outline.
1.3.3 Mounting
The detail specification shall specify the method of mounting recommended for normal use
and the method which is mandatory for the application of the vibration, bump, shock and
endurance tests. The design of the filter may be such that special mounting fixtures or heat
sinks are required in its use. In this case, the detail specification shall describe the mounting
fixtures and they shall be used in the application of the vibration, bump or shock tests. The
specified heat sink shall be used in the application of the endurance test.

---------------------- Page: 12 ----------------------

– 8 – 60939-2  IEC:2005(E)
If recommendations for mounting for "normal" use are made, they shall be included in the
detail specification under 1.8 "Additional information (not for inspection purposes)". If they are
included, a warning can be given that the full vibration, bump and shock performance may not
be available if mounting methods other than those specified in 1.1 of the detail specification
are used.
1.3.4 Ratings and characteristics
1.3.4.1 General
The ratings and characteristics shall be in accordance with the relevant clauses of this
specification.
1.3.4.2 Particular characteristics
Additional characteristics may be listed when they are considered necessary to specify
adequately the filter for design or application purposes.
1.3.5 Marking
The detail specification shall specify the content of the marking on the filter and the package.
1.4 Terms and definitions
For the purposes of this Sectional specification, the terms and definitions given in 2.2 of
IEC 60939-1, as well as the following apply.
1.4.1
a.c. mains filter (or mains filter)
passive filter unit designed essentially for application with a power-frequency alternating
voltage supplied from the mains
1.4.2
class X capacitor
capacitor of a type suitable for use in situations where failure of the capacitor would not lead
to danger of electric shock but could result in a risk of fire.
Class X capacitors are divided into three subclasses (see Table 1) according to the peak
voltage of the impulses superimposed on the mains voltage to which they may be subjected in
service. Such impulses may arise from lightning strikes on outside lines, from switching in
neighbouring equipment, or switching in the equipment in which the capacitor is used.
Table 1 – Classification of class X capacitors
Subclass Peak pulse IEC 60664 Application Peak impulse voltage U
p
voltage in service insulation applied before endurance test
category
X1 > 2,5 kV III High pulse when C ≤ 1,0 µF : U = 4,0 kV
R P
application
≤ 4,0 kV
4
when C > 1,0 µF : U = kV
R P
6
C × 10
R
X2 II General
≤ 2,5 kV when C ≤ 1,0 µF : U = 2,5 kV
R P
purpose
2,5
when C > 1,0 µF : U = kV
R P
6
C × 10
R
X3 ≤ 1,2 kV - General none
purpose

---------------------- Page: 13 ----------------------

60939-2  IEC:2005(E) – 9 –
1.4.3
class Y capacitor
capacitor or RC-unit of a type suitable for use in situations where failure of the capacitor could
lead to danger of electric shock.
Class Y capacitors are further divided into four subclasses Y1, Y2, Y3 and Y4, as shown in
Table 2.
(IEC 60384-14, 1.5.4)
Table 2 – Classification of class Y capacitors
Subclass Type of insulation bridged Range of rated voltages Peak impulse voltage
before endurance test
Y1 Double insulation or reinforced ≤ 500 V 8,0 kV
insulation
Y2 ≥ 150 V
5,0 kV
≤ 300 V
Basic insulation or supplementary
Y3
≥ 150 V
insulation
none
≤ 250 V
Y4 < 150 V 2,5 kV
NOTE For definitions of basic, supplementary, double and reinforced insulation, see IEC 61140.

One Y-capacitor may bridge basic insulation. One Y-capacitor may bridge supplementary
insulation. If combined basic and supplementary insulations are bridged by two Y2-, Y3- or
Y4-capacitors in series, they must have the same nominal value.
For guidance on the application of capacitors bridging basic insulation, see 6.1 of IEC 60940.
1.4.4
earth inductor
inductor that forms part of the earth lead of a filter
1.5 Marking
...